To keep track of these refits, the Mark system was created. While the Type of a TARDIS is always fixed, the Mark number is much more variable. It denotes the current sophistication of the Master Control Console (and, by extension, many of the other peripheral systems). Thus a TARDIS could be a Type 35 Mark I or a Type 35 Mark III. Both capsules were originally Type 35s, but a majority of their control console's systems have been upgraded. A Time Lord would find that all Mark III TARDISes (regardless of their Type) have many of the same systems and extras.
So, the Type designates the specific model of TARDIS that was produced by the Neural Construction Docks. The Mark Number designates the current capabilities and level of sophistication of the TARDIS's guidance systems. Time Travel Capsules are sometimes described using a three number expression. For example a Type 7-0-6 refers to a Type 70 TT Capsule with a Mark VI capabilities.
(given as the age of the Doctor)
|GAP BETWEEN RELEASE|
|Type 31-41||Mark I||c.- 8982||N/A|
|Type 42 -47||Mark II||c. -8485||497|
|Type 48-53||Mark III||c. 200||8685|
|Type 54-59||Mark IV||380||180|
|Type 60-65||Mark V||c. 560?||180|
|Type 66-71||Mark VI||c. 756||180|
|Type 72-77||Mark VII||c. 787||31|
|Type 78-83||Mark VIII||c. 818?||31|
|Type 84-88||Mark IX||c. 840||31|
|Type 89||Mark X||c. 890||c. 50|
The following color code is used:
- Black: For information from the TV Series, including Dimensions in Time, and 1996 TV Movie.
- Blue: For information from the Novels and Audios including Target, Virgin, BCC, and Big Finish.
- Green: For information from 'licensed' reference sources such as the Technical Manual, Doctor Who Magazine, and the Role Playing Games.
- Red: For information from unofficial sources -The Faction Paradox series, behind the scenes interviews, author's speculation, and popular fan belief.
The TARDIS Technical Index is copyright Will B Swift.